The Engine Fault Code P0690 refers to an issue with the ECM (Engine Control Module) or PCM (Powertrain Control Module) power relay sense circuit. Specifically, it indicates that the voltage in the power relay sense circuit is higher than expected. This can mean that the ECM is not receiving the correct voltage to operate properly.
Different manufacturers may have slightly different interpretations or related issues, but the core problem typically remains the same. Here are some alternative meanings or related issues based on different manufacturers:
1. General Meaning: High voltage in the power relay sense circuit, indicating a potential issue with the relay or wiring.
2. P0690 for Porsche: May indicate a fault with the power supply to the DME (Digital Motor Electronics) module, which could affect engine performance.
3. P0690 for Mercedes: Could signal a malfunction in the power distribution system affecting the engine control unit.
4. P0690 for Audi: Might indicate a problem with the power relay that supplies voltage to the engine control module, leading to engine management issues.
5. P0690 for Jaguar: Could suggest a fault in the power supply circuit, potentially affecting various electronic systems in the vehicle.
6. P0690 for Land Rover: May indicate an issue with the power relay that can affect the vehicle`s electronic stability and engine performance.
Our view, if you encounter this code, its best to check the power relay, wiring, and connectors related to the ECM/PCM. A thorough inspection can help identify the root cause of the issue. If you`re not comfortable diagnosing or fixing it yourself, it might be a good idea to consult a professional mechanic.
The Engine Fault Code P0690 indicates a problem with the Power Relay Sense Circuit in the Engine Control Module (ECM) or Powertrain Control Module (PCM). This code typically means that the ECM/PCM is detecting a high voltage in the power relay circuit. Here are some common causes:
1. Faulty Power Relay: The relay that supplies power to the ECM/PCM may be malfunctioning, causing incorrect voltage readings.
2. Wiring Issues: Damaged or corroded wiring in the power relay circuit can lead to high voltage readings. Look for frayed wires or poor connections.
3. Faulty ECM/PCM: The control module itself might be faulty, causing it to incorrectly interpret the voltage levels.
4. Battery Voltage Issues: High voltage from the battery or charging system can cause this code. Ensure the battery and alternator are functioning properly.
5. Ground Issues: Poor grounding can also lead to incorrect voltage readings. Check ground connections related to the ECM/PCM.
6. Short Circuits: A short circuit in the wiring can cause excessive voltage to be sent to the ECM/PCM.
While these causes are generally applicable, there can be manufacturer-specific variations:
– Porsche: Look for issues specific to the wiring harness, as they can be more sensitive to wear.
– Mini: Mini vehicles might have unique relay designs; check the specific relay type used.
– Mercedes: Mercedes models may have additional electronic control modules that could impact the relay circuit.
– Audi: Audi vehicles often have complex electrical systems; consider checking for software updates or faults in related modules.
– Jaguar: Jaguar vehicles may have specific relay configurations; refer to the owners manual for relay locations.
– Land Rover: Land Rover models may experience issues with the Terrain Response system affecting the ECM/PCM.
Always consult the vehicle`s service manual for specific diagnostic procedures and wiring diagrams.
The P0690 code indicates a problem with the ECM (Engine Control Module) or PCM (Powertrain Control Module) power relay sense circuit. This code can appear in various vehicles, including those from Porsche, Mini, Mercedes, Audi, Jaguar, and Land Rover. Heres a step-by-step guide on how to troubleshoot and fix this issue:
General Steps to Fix P0690
1. Check the Battery and Connections:
– Ensure the battery is fully charged and in good condition.
– Check all battery connections for corrosion or looseness.
2. Inspect the Fuses:
– Locate the fuse box and check for any blown fuses related to the ECM or PCM. Replace any blown fuses.
3. Examine the Power Relay:
– Locate the power relay for the ECM/PCM. This is often found in the fuse box or under the hood.
– Remove the relay and inspect it for damage. Swap it with a similar relay (if available) to see if the code clears.
4. Check Wiring and Connectors:
– Inspect the wiring leading to the ECM/PCM and the relay for any signs of damage, fraying, or corrosion.
– Make sure all connectors are securely attached and free of dirt or moisture.
5. Scan for Additional Codes:
– Use an OBD-II scanner to check for any other stored trouble codes. This can provide more insight into the issue.
6. Test the ECM/PCM:
– If all the above checks out, the ECM/PCM itself may be faulty. Testing or replacing the module may be necessary.
Manufacturer-Specific Considerations
– Porsche:
– Check for software updates for the ECM. Sometimes, a simple reflash can resolve issues.
– Mini:
– Look for known issues with the specific model year related to wiring harnesses or connectors that may lead to this code.
– Mercedes:
– Mercedes vehicles may have additional modules that interact with the ECM. Ensure all related modules are functioning correctly.
– Audi:
– Audi models may have specific relay locations and configurations. Refer to the service manual for your model.
– Jaguar:
– Check for any known recalls or service bulletins related to the ECM or power relay.
– Land Rover:
– Land Rovers may have complex electrical systems. If youre unsure, consulting a professional may be wise.
Final Steps
After making repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive. If the code returns, further diagnosis may be necessary. If youre not comfortable with these steps or if the problem persists, consider seeking help from a professional mechanic.
Driving with a P0690 code, which indicates a problem with the ECM/PCM power relay sense circuit, is generally not safe. This code suggests that the power relay responsible for supplying power to the engine control module (ECM) or powertrain control module (PCM) is not functioning correctly. Heres a breakdown of what this means for various manufacturers:
General Points:
1. Engine Performance: The vehicle may experience poor performance or may not start at all.
2. Electrical Issues: You might face issues with other electrical components since the ECM/PCM controls many systems.
3. Potential for Stalling: The car could stall unexpectedly, which is dangerous while driving.
Manufacturer-Specific Considerations:
– Porsche: If you see this code in a Porsche, it could lead to significant engine management issues. It`s best to have it checked immediately.
– Mini: For Mini vehicles, this code can affect the engine`s ability to run properly. Continuing to drive may cause further damage.
– Mercedes: In Mercedes models, the ECM is crucial for performance. A malfunction could lead to limp mode, limiting speed and power.
– Audi: In Audis, this code can lead to various electrical problems. Driving with this code could cause more complex issues down the line.
– Jaguar: Jaguars are sensitive to electrical issues. If you see this code, its advisable to stop driving and get it checked.
– Land Rover: For Land Rovers, this code can indicate issues with the vehicle`s ability to manage power. Driving could lead to unexpected failures.
In all cases, its best to address a P0690 code as soon as possible. If you encounter this code, consider pulling over safely and having the vehicle towed to a mechanic for inspection. Ignoring the issue can lead to more serious and costly repairs.
